Quartz itself is transparent or transluscent. But trapped impurities such as iron, copper, etc give quartz a full rainbow of colors to choose from.
Impurities gives quartz its many beautiful colors.
Quartz is a color.
Pure quartz is a colorless mineral, and so a pure quartz sandstone will appear white due to multiple reflections and refractions between grains. However, impurities in the sandstone may give it some other color. What color it turns out as depends on the impurities. For example, iron oxide will produce a red sandstone.
Impurities gives quartz its many beautiful colors.
Quartz has a white streak.
Amethyst is a violet form of quartz.
White.
Rose quartz typically exhibits a pale to medium pink color with a white streak.
Quartz is colorless when pure, but can be found in all colors of the rainbow.
Amethyst gets its purple color from trace amounts of iron impurities within the quartz crystal structure. These impurities create color centers in the crystal lattice that absorb light in the visible spectrum, resulting in the characteristic purple hue of amethyst.
White.
Arkose is a type of sandstone that contains more than 25% feldspar, along with quartz and other minerals like mica, magnetite, and hematite. The feldspar content gives arkose its distinct pinkish color.